Typewriting machine



w. P. GEHRETT.- TYPEWRITING MACHINE I APPLICATION FILED JULY 29,1920.

1 ,429,336, I Patented Sept. 19,1922.

WITNESSES I INVENTEIR HIS ATTORNEY V Patented Sept. 19, 1922.

UNrrsn STATES WALTER P. GEHRETT, OF SAN FRANCISCO, CALIFORNIA, ASSIGNOR 'IO REMINGTON TYPEWRITEB COMPANY, OF ILION, NEW YORK, A CORPORATION OF NEW YORK.

TYPEWRITING- MACHINE.

Application filed July 29, 1920. SeriaLNo. 399,698.

To all whom it may concern:

Be it known that I, WALTER P. GEHRETT,

- citizen of the United States, and resident of San Francisco, in the county of San Francisco and State of California, have invented certainlnew and useful Improvements in Typewriting Machines, of which the following is a specification. I

My invention relates to typewriting machines, and it has for its principal object to provide an improved means whereby the main or carriage-driving spring can be attached .to and detached from the machine more conveniently than heretofore.

It is a further object of the invention to provide a container for the drivingspring which may be conveniently carried around by the repairman independently of the spring drum and to .so construct the parts as that when it is'necessary for the repairman to substitute for a broken or damaged spring a new. spring, it is merely essential for the repairmanv to detach the old spring with its container from within the, spring drum and to replace it with a I new spring and its container, whereas for- .merly itv was customary for the repairman to carry withhim not only thenew spring but alsov the entire spring drum and parts attached thereto.

To the above ends my invention consists.

in certain features of construction, and combinations and arrangements of parts, all.

of which will be set forth herein and particularly pointed out in the claims.

In theaccompanying drawings, Figure 1 is a front to rear vertical sectional v view;,of a portion of a Remington No. 10 typewriter, the section being taken centrally of the spring drum.

Figure 2 is a front vlew in section on the 7 any suitable sort.

is journaled the fore and aft extending shaft 5 ofthe spring drum. Said shaft has a middle part 6 of relatively large diameter about which the driving spring 7 is coiled,.and a rear endpart 8 of less diameter and, forward ofthe enlarged part 6, another part 10 of reduced diameter and which is jo'urnaled in the boss 1 of the bracket 2. Forward of the part 10 is a further reduced and squared part 11,.and

the extreme front end 12 of the shaft is round'and threaded. A ratchet wheel 13 anda cup-shaped washer or head 14;.are

mounted on: the, squared part 11 andv are;

boss 20 of the bracket 2. These parts have not been fully shownor described for thereason that they are familiar to persons skilled in the art, havingv beenfor. a good while in use onthe Remington machine.

1 The rotary carriageedriving -or spring drum 21 having a connecting tape 22wound partway about its periphery, 1s here. shown as being in the nature of a wheelmade of sheet metal and staked to, ahub 23 which is journaled on the rear reduced part Slof the shaft 5. A beveled gear 2i isjournaled on the rear part, of the hub 23 and meshes with a beveled gear 25 to drive, the ribbon spools of the machine. The gear, 2 1 has integral therewith a ratchet wheel26 en-U gaged by a pawl27 pivoted at-28 tothe driving, drum 21 so as to feed the ribbon in only'one direction.

' The above partsv have been described, or

briefly, referred to merely because they are portions of theRemington typevs' riter'with which the driving spring is immediately associated. ,Asfar as my invention is con- .cerned these assoclateddevlces can be .of

It will be understood that the drum 21 includes a web-part 30,, hereshown as. cut

out to make four spokes, and a cylindrical flange-part 31 on which latter the tape 22' is wound. Posts 32 are riveted to the webpart 30 and extend parallel with the shaft 5. In the present instance T have shown two such posts diametrically opposite to each other. The spring 7 is enclosed in a container 33, which as here shown is in the form of a sheet metal ring with a hook 3% struck inward therefrom and to which the outer end of the spring 7 is connected, said spring being perforated and caught over the hook in the usual manner. The ring 33 is flanged preferably at one edge thereof, the flange part, as shown in the present instance, consisting of two ears 35, each notched or perforated at 36. If the parts be held in the relative positions shown in Fig. 3 the container can be slipped axially into the drum 21 between the posts 32, the spring 7 encircling the part (3 of the shaft 5 and the posts 32 entering the perforations 36, whereupon the spring container 33 will be mounted in and interlocked with the drum or wheel 21, and by the device described independent rotary movement of the ring with respect to the wheel will be prevented, though the two may turn together during the travel of the carriage.

The container can be secured in the drum against accidental axial displacement in any suitable way. The means shown in tie present instance consists of a cover plate 37 (Fig. l) laid flat against the ends of the posts 32 and secured to said posts by screws 33 screwed into the interiorly threaded ends of the posts. Tn the Remington machine, as heretofore constructed, there have been posts like the posts 32 and a cover plate 37 secured in position in the manner described; but the spring has been connected directly with the drum or wheel 21 and not mounted in a separate detachable container. In the present instance I have shown the perforations 36 as round holes but it will readily be perceived that the ears could be out of? at the broken lines 40 (Fig. 2) if preferred, leaving only notches to engage the posts 32.

The inner end of the spring is perforated as shown at ll 3) to engage a pin 42 projecting from the shaft 5. This form of connection is such that when the inner end of the spring is slipped over the shaftif the pin does not happen to go into the hole at first it will be drawn into it by relative turning of the parts.

As shown in the present instance, the flange 31 of the drum 21 is at one point out and bent inward, forming a tongue 43 and a slot 44- through which the tape 22 passes to the inside of the drum. To the inner end of the tape is attached a ring 45 and a screw 46 passes through a hole in the flange 31 and through the ring and is threaded into an ear 47 bent up out of the web of the wheel.

it has heretofore been the practice in manufacturing these machines to mount the driving spring in the drum or wheel 21 and in assembling the machine this drum and spring formed a unit. Also repairmen, who have to go about to the various oflices where the machines are in use, were required to carry with them the entire drum 21 with the sprin mounted in it in case they were called upon to replace a broken driving spring. By the use of the present improvement springs are much more conveniently stored in the small containers 33, and one of these containers with a new spring 7 mounted in it makes a much more convenient unit for the repairman to carry about with him. Besides this new construction simplifies and cheapens repair work with respect to the driving springs.

Various changes may be made without departing from my invent-ion.

What I claim and desire to secure by Letters Patent is:

1. In a typewriting machine, the combination with the carriage-driving drum or wheel having posts therein, of a unit structure consisting of a driving spring and a container ring in which said spring is mounter, said ring being adapted to be inserted in said wheel between said posts and having flanged parts for engagingsaid posts to hold the container in place.

2. Tn a typewriting machine, the combination with a carriage-driving drum or wheel having posts therein, of a unit structure consisting of a driving spring and a container ring in which said spring is mounted, said ring being adapted to be inserted in said wheel between said posts and having flanged parts for engaging such posts; and a cover plate mounted on the ends of said posts to retain said container and spring against accidental displacement axially.

3. In a typewriting machine, the combination with a carriage driving drum including a web-portion having parts projecting therefrom parallel with the axis of the drum, of a spring container adapted to be inserted in the drum between said projecting parts and having flanged parts adapted to engage said projecting parts of the drum.

Signed at the city of San Francisco, in the county of San Francisco and State of California, this 20th day of July, A. D.

WALTER P. GEHRETT. lVitnesses TV. W. HEALEY, M. E. EWING. 

